大约有 44,000 项符合查询结果(耗时:0.0623秒) [XML]
selecting unique values from a column
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I found that this was not helpful. Say you have 5 items, all with the same date but different description. Using the above command will show distinct dates, but only the description of the first item found.
– onebree
Apr 21 '15 at 15:58...
How do I keep track of pip-installed packages in an Anaconda (Conda) environment?
... on the Anaconda user group and heard from @Travis Oliphant himself on the best way to use conda to build and manage packages that do not ship with Anaconda. You can read this thread here, but I'll describe the approach below to hopefully make the answers to the OP's question more complete...
Examp...
What to do on TransactionTooLargeException
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best answer for me. Thank you very much
– pavel
Sep 15 '17 at 19:38
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Read each line of txt file to new array element
...being read as only a single big value array, whole text was just one array item $myarr[0], so shuffling did not work on a single item. Hope it helps someone. Thanks again.
– washere
Apr 21 '17 at 21:54
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Why no ICloneable?
...T> had a clone method, I would expect it to yield a List<T> whose items have the same identities as those in the original list, but I would expect that any internal data structures would be duplicated as needed to ensure that nothing done to one list will affect the identities of items stor...
What can you use Python generator functions for?
...construct that iterates. You can think of generators as returning multiple items, as if they return a list, but instead of returning them all at once they return them one-by-one, and the generator function is paused until the next item is requested.
Generators are good for calculating large sets of...
switch / pattern matching idea
...le. Things like ForEach or Process ("Apply"? -- do an action on a sequence item as it's enumerated) fit in because C# syntax supports it well.
Abstracting common statement patterns. Complicated try/catch/finally blocks or other involved (often heavily generic) code blocks. Extending LINQ-to-SQL fits...
$(document).ready equivalent without jQuery
...ork when the document is already finished loading, please update your (imo best) answer if you can: if (document.readyState == 'complete') { init(); } else { document.onreadystatechange = function () { if (document.readyState == 'complete') { init(); } } }
– ZPiDER
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Purpose of Unions in C and C++
...agree, without entering the undefined-behaviour chaos, perhaps this is the best intended behaviour of unions I can think of; but won't is waste space when am just using, say int or char* for 10 items of object[]; in which case, I can actually declare separate structs for each data type instead of VA...
What are some (concrete) use-cases for metaclasses?
..., name, bases, attrs):
fields = {}
for key, value in attrs.items():
if isinstance(value, Field):
value.name = '%s.%s' % (name, key)
fields[key] = value
for base in bases:
if hasattr(base, '_fields'):
fiel...
